Electric signaling device.



No. 828,368. 7 PATENTBD AUG.14, 1906.

' H. M. BASGOM.

ELECTRIC SIGNALING mzvwz.

APPLIOATION IILED SEPT. 21. 1904.

wi/lmeooaq 80mm may W4 "UNITED sTArEs PATE T IFl EE i HENRY MELVINBASCOM, OF BROOKLYN, NEW YORK, ASSIGNOR QF ONE-HALF-TO JOHN F. HEMENWAY,OF NEW YORK. N. Y.

ELECTRIC SIGNALING DEVICE.

Specification of Letters Patent.

atented Aug. 14, 190

To all whom it may concern: I

Be it known that'I, HENRY MELvIN BAS- COM, a citizenof the UnitedStates, residing at Brooklyn, New York, have invented new and usefulImprovements in Electric Sign aling Devices, of which the following is aspecification.

My invention relates to electric signaling devices.

The object of my invention is to construct a signaling instrument thatWill only respond to a pulsating or intermittent current of but onedirection; and the invention consists of certain combinations ofelements hereinafter described.

My invention is illustrated in the accompanying drawings, in whichFigure 1 is a view of an electrical signaling instrument embodying theinvention, and Figs. 2 and 3 are diagrammatic views.

In the drawings, 1 and 2 are two coils of an electromagnet. A permanentmagnet 3 is so arranged that one polesay the south pole is connected tothe yoke y of the electromagnet and the other pole is in close proximityto a soft-iron armature 4, mounted on a horizontal axis as. Thepermanent magnet magnetizes by induction the armature 4, making its endsnorth poles. The armature is held against the pole of coil 1 by thespring 5. The motion of the armature to the right or left about its aXiswill cause the hammer 6 to strike the gongs 7 a and 7 alternately.

The terminals of coil 1 are connected to the source of current, whilethe terminals of coil 2 are joined together.

A current entering coil 1 will induce a momentary current in coil 2 in adirection tending to oppose any action in the core of the electromagnetcaused by the current in coil 1. The cessation of a current in coil 1will induce a momentary current in coil 2 in a direction tending toprolong and intensify any action in the core of the electromagnet causedby the current in coil 1.

Assuming a positive current to enter coil 1 at the terminal A, therewill be produced at the pole of coil 1 a north pole and there will be atendency to produce at the pole of coil 2 a south pole. This tendencywill be momentarily neutralized by the induced current in coil 2. If thecurrent should cease in coil 1, a strong south pole would suddenly beproduced at the pole of coil 2. This would momentarily attract thearmature A against the pressure of the spring 5. When the attraction ofthe armature ceases, the latter is again forced back to the pole of coil1 by the spring 5. Therefore a pulsating or intermittent currententering at A of coil 1 would cause the armature 4 to oscillate and thehammer 6 to strike the gongs 7 a and 7 A negative current, eithersteady, pulsating, or intermittent, entering the coil 1 at the terminalA will cause no movement of the-armature 1, as at no time would acurrent of this kind produce a south pole at the pole of coil 2. As themovement of the armature takes place after the current has ceased incoil 1 a negative current entering coil 1 at the terminal A immediatelyafter the current of the opposite direction has ceased will prevent anymovement of the armature 4, as it would produce a south polarity at thepole of coil 1 which would also attract the armature 4; but as thearmature is already held against the pole of coil 1 no movement of thearmature will take place. Therefore an alternating current will not ringthis bell.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. An electric signaling instrument, comprising the combination of anelectromagnet, having two coils, one of said coils being connected to asource of current, and the other coil being independent of the source ofcurrent, and an armature normally held against the pole of one coil ofsaid electromagnet, and adapted to be attracted to the other coil uponcessation of current in the first coil, substantially as described.

2. An electric signaling instrument, comprising the combination of anelectromagnet having two coils, the terminals of one of said coils beingconnected to a source of current, and 'the terminals of the other coilbeing joined together, and an armature adapted to be attracted to thepole of the second coil When a current has ceased in the first coil,substantially as described.

3. An electric signaling instrument, comprising the combination of anelectromagnet having two coils, one ofsaid coils being connected to thesource of current and the terminals of the other coil being connectedtogether, an armature pivotally suspended over said coils, a permanentmagnet for magnetizing said armature, a hammer depending 0nd coil,.saidinduced current being inefiect from said armature, associated with twoive during the flow of current through the bells, and means foroscillating said hammer between the bells, and causing a signal to begiven, substantially as described.

4. An electric signaling instrument, including an electromagnet havingtwo coils, one of said coils being connected to a source of current andthe other coil comprising a shortcircuited electrical conductor, and.

means for causing a currentto pass through the first coil and induce acurrent in the secfirst coil, and becoming effective after cessa- 15tion of current in the "first coil, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses. I

. HENRY MELVIN BASCOM.

Witnesses:

JOHN A. PERCIVAL, H. M. KUEHNE.

